The game is very flawed, and nowhere close to the top Metroid games, but I have fun playing it. It's hard to talk about Other M without pointing out flaws though. All the complaints that I've ever read about it make perfect sense.

Stuff I like: the gameplay is fast, and the pacing is decent with not a lot of filler. You're always on the move, pixel hunting aside. Missiles are powerful. Post-game content is great (or maybe I'm just happy I finally get to explore the station). I also like how you can kill all enemies in a room to reveal items.

You can see Team Ninja completely changing the way they make games in recent years, it's pretty sad... between Ninja Gaiden Sigma 2, Other M and NG3, there are less and less traditional gameplay elements like enemy drops and customization. Everything you get is scripted. There's very little strategy in Other M's combat, even less so in Ninja Gaiden 3. No incentive for collecting anything out of the way, nothing to learn about the gameplay mechanics. Everything is just barebones.